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. a middle class to rebuild. but the last thing we should do is turn back now. president obama: i'm barack obama and... i approve this message. [ female announcer ] the power to become a better investor has gone mobile. with features like scanning a barcode to get detailed stock quotes to voice recognition. e-trade leads the way in wherever, whenever investing. download the ultimate in mobile investing apps, free, at e-trade. [ticking] >> shale gas may be a significant new energy source, but it may come with some very toxic side effects. among them, the chemicals used in fracking may cause health problems and contaminate the water supply. the safety record of chesapeake energy may be better than most, but the company had an accident in louisiana that drew a lot of attention. it happened in 2009 when 17 cows grazing near a drilling site died a gruesome death after drinking fracking fluids that ran off into their pasture. industry-wide, accidents keep happening-- like this well explosion-- due to machine malfunctions or workers cutting corners. environmentalists like michael brune, executive
. >> president obama was concerned enough to ask his commission on bioethics to hold hearings on venter's new technology shortly after the results were published in the journal science. apart from the legal and regulatory questions raised, there are some moral and ethical ones as well. there are a lot of people in this country who don't think that you ought to screw around with nature. >> we don't have too many choices now. we are a society that is 100% dependent on science. we're going to go up in our population in the next 40 years. we can't deal with the population we have without destroying our environment. >> but aren't you playing god? >> we're not playing anything. we're understanding the rules of life. >> but that's more than studying life; that's changing life. >> well, domesticating animals was changing life. domesticating corn... when you do crossbreeding of plants, you're doing this blind experiment where you're just mixing dna of different types of cells and just seeing what comes out of it. >> this is a little different, though. this is another step, isn't it? >> yeah, now we're
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